|  | 
				 
				Beam power amplifier (tetrode) 
				Introduced in 1938 
					
						| 1 | 2 | 3 | 4 | 5 | tc | Base |  
						| f | g2 | g1 | k,g3 | f | a | UY5 |    
					
						| Vf | Af | Va | Vs | Vg | mAa | mAs | gm | Pout | Pdiss |  
						| 6.3 | 0.9 | 600 | 300 | -28 | 40 | 3 | 6 | 12.5 | 25 |    
							
								| Equivalent | 4Y25, 807,
								ATS25, 
								ATS25A, CV1060, CV124, CV1364, CV1374, CV1572, 
								QE06/50, QV0525, VT100, VT100A |      |